Page 1:SilverStone ST80F-TI Power Supply Review
Page 2:Packaging, Contents, Exterior And Cabling
Page 3:A Look Inside And Component Analysis
Page 4:Load Regulation, Hold-Up Time And Inrush Current And Protections
Page 5:Efficiency, Temperature And Noise
Page 6:Protection Features Evaluation
Page 7:Cross-Load Tests And Infrared Images
Page 8:Transient Response Tests
Page 9:Ripple Measurements
Page 10:Performance, Performance Per Dollar, Noise and Efficiency Ratings
Page 11:Pros, Cons And Final Verdict
Efficiency, Temperature And Noise
Our efficiency testing procedure is detailed here.
Using the results from the previous page, we plotted a chart showing the ST80F-TI efficiency at low loads, and loads from 10 to 110 percent of its maximum-rated capacity.
The overall efficiency under normal loads is very high, though SilverStone cannot match the efficiency of EVGA's 850 T2. Then again, the Titanium-rated EVGA offering also costs a lot more. At lower loads, the situation flips and SilverStone's ST80F-TI beats the 850 T2 by almost 1%.
Efficiency At Low Loads
In the following tests, we measure the ST80F-TI's efficiency at loads significantly lower than 10 percent of its maximum capacity (the lowest load the 80 PLUS standard measures). The loads we dialed were 20, 40, 60 and 80W. This is important for representing when a PC is idle, with power-saving features turned on.
|Test #||12V||5V||3.3V||5VSB||DC/AC (Watts)||Efficiency||Fan Speed||Fan Noise||PF/AC Volts|
|1||1.231A||0.492A||0.474A||0.200A||19.63||74.61%||705 RPM||26.0 dB(A)||0.821|
|2||2.489A||0.998A||0.980A||0.400A||39.74||84.86%||705 RPM||26.0 dB(A)||0.889|
|3||3.748A||1.497A||1.485A||4.980A||59.85||88.83%||705 RPM||26.0 dB(A)||0.926|
|4||4.997A||2.004A||1.961A||0.800A||79.77||91.80%||705 RPM||26.0 dB(A)||0.940|
Under light loads, the ST80F-TI is highly efficient. It even beats the similar-capacity, high-end Super Flower designs. In addition, noise output is kept at very low levels since the fan rotates at its minimum speed.
The ATX specification states that 5VSB standby supply efficiency should be as high as possible, recommending 50 percent or higher with 100mA of load, 60 percent or higher with 250mA of load and 70 percent or higher with 1A or more of load.
We will take four measurements: one each at 100, 250 and 1000mA, and one with the full load the 5VSB rail can handle.
|Test #||5VSB||DC/AC (Watts)||Efficiency||PF/AC Volts|
The 5VSB rail achieves good efficiency levels, though they're not the highest we've ever seen on this rail.
Power Consumption In Idle And Standby
In the table below, you'll find the power consumption and voltage values of all rails (except -12V) when the PSU is idle (powered on, but without any load on its rails), and the power consumption when the PSU is in standby mode (without any load, at 5VSB).
The PSU needs very little energy in standby, with both input voltages.
Fan RPM, Delta Temperature And Output Noise
Our mixed noise testing is described in detail here.
The first chart below illustrates the cooling fan's speed (in RPM), and the delta between input and output temperature. The results were obtained at 35 °C (95 °F) to 47 °C (116.6 °F) ambient temperature.
The next chart shows the cooling fan's speed (again, in RPM) and output noise. We measured acoustics from one meter away inside of a small, custom-made anechoic chamber with internals completely covered in sound-proofing material (be quiet! Noise Absorber kit). Background noise inside the chamber was below 18 dB(A) during testing, and the results were obtained with the PSU operating at 35 °C (95 °F) to 47 °C (116.6 °F) ambient temperature.
The following graph illustrates the fan's output noise over the PSU's operating range. The same conditions of the above graph apply to our measurements, though the ambient temperature was between at 28 °C (82.4 °F) to 30 °C (86 °F).
Under normal ambient temperatures, noise output is low thanks to the high efficiency levels that minimize energy losses, especially under light and moderate loads. Despite the use of a smaller, 120mm fan, lower thermal loads don't necessitate increased airflow. As a result, there's no need for an aggressive fan profile. When ambient temperatures crest 40 °C, however, the situation changes.
- SilverStone ST80F-TI Power Supply Review
- Packaging, Contents, Exterior And Cabling
- A Look Inside And Component Analysis
- Load Regulation, Hold-Up Time And Inrush Current And Protections
- Efficiency, Temperature And Noise
- Protection Features Evaluation
- Cross-Load Tests And Infrared Images
- Transient Response Tests
- Ripple Measurements
- Performance, Performance Per Dollar, Noise and Efficiency Ratings
- Pros, Cons And Final Verdict